Chair-back desk.



No. 659 43|. @atenten ont. 9 |900 w.H. ANDERSON.

CHAIR BACK DESK.

(Application filed July 7, 1900.)

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CHAIR BACK DESK.

(Application filed, July 7, 1900.)

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UNITED STATES lPATENT OFFICE.

WILLIAM H. ANDERSON, OF NEW YORK, N. Y.

CHAIR-BACK DESK.

SPECIFICATION forming part of Letters Patent No. 659,431, dated October`9, 1900.

Serial No. 22 ,7 85. (No model.)

To all whom, t may concern:

Be it known that I, WILLIAM H. ANDERSON, a citizen of the United States,and a resident of New York, county andState of New York, have inventedcertain new and useful Improvements in Chair-Back Desks, of which thefollowing is a specification.

This invention relates to a desk adapted to be attached to achair-back'by various adjustments, so as to constitute either ablackboard, a table, or a desk proper.

In the accompanying drawings, Figure l is a perspective view of thedesk, showing it adjusted to serve as a blackboard; Fig. 2, a centralvertical section thereof; Fig. 3, a top view of Fig. 2; Fig. 4, asection on line 4:4, Fig. 2; Fig. 5, a vertical section of the devicewhen adjusted to constitute a table or desk proper, and Fig. 6 avertical section showing the device adjusted to constitute an extendedtable.

The letter at represents a plate the outer or upper side of which iscoated to constitute a blackboard.- To the lower side of plate ct aresecured two arallel rails a and a de ending p a p :v

screw a2 between said rails.

To the plate constructed as abovedescribed is adapted to be secured aremovable and reversible frame, by means of which the plate may besecured to a chair-back A in various positions. This frame consists,essentially, of two parallel rails b, adapted to engage the outer sidesof the rails a. The rails b are connected by three cross-pieces b', b2,and b3. The cross-piece or fixed jaw has a concave inner face adapted tofit and engage the chairback. The cross-piece b2 has a tapped openingthrough which passes a screw b4, carrying a convex movable jaw b5, thewhole constituting a vise which cooperates with the fixed jaw b tosecure the frame to the chair-back. The cross-piece b3 is perforated toadmit the screw a2, carrying a nu't a3, by means of which the frame isremovably and reversiblysecured to the plate a. To the cross-piece b3are furthermore pivoted a pair of clasps or turn-buttons b, by which thedevice may be suspended from the chair-back. The rails b have tongues t7formed along their outer sides, which are adapted to be engaged by apair of grooved rails c, carrying bearings c. In these bearings turns ashaft c2, that passes through the cheeks c3 of a shaft c4. the outerthreaded ends of the shaft c2 and en- Nuts c5, mounted upon gaging thebearings c', are adapted to clasp the shelf c4 at any angle desired.

In use the frame is attached to the plate a, by means of the nut a3 iusuch a manner that the frame will be placed entirely beneath the plate,and then the combined device may be suspended from a chair-back by meansof the turn-buttons 196, Fig. l. Thus the plate a presents an inclinedblackboard to the person behind the chair, while the shelf c4, adjustedat any angle desired, is adapted to hold the chalk and other utensils.If the device is to constitute la table, it is by means of the jaws b b5clamped to the chair-back in a slightlyinclined orhorizontal position,so that the plate a projects over the chair-seat. If the shelf c4 issecured to the back of plate a, (dotted lines, Fig. 5,) the deviceconstitutes a table, while when the shelf is secured to the front of theplate a (full lines, Fig. 5) the device constitutes a desk. Finally, theframe may be removed from plate a, reversed, and reatta'ched, so as toproject rearwardly beyond said plate. If the frame is now clamped to thechair-back by the jaws b b5, the plate a will project a considerabledistance farther forward, Fig. 6, to constitute an extended table thatprojects beyond the chair-seat. Thus it will be seen that by a simpleadjustment my improved desk may be transformed into any one of a numberof useful articles of furniture.

What I claim isl. The combination of a plate with a removable andreversible frame having a pair of jaws and a pair of turn-buttons, andwith means for removably securing the frame to the plate, substantiallyas specified.

2. A plate havingascrewand nutcombied with a removable and reversibleframe having a xed jaw, a movable jaw, and a perforated-cross-pieceadapted to be engaged by the screw, and with a shelf having railsadapted to removably engage either end of the frame and to be set todifferent angles, substantially as specified.

. Signed by me at New York city, county and State of New York, this 6thday of .Iuly,-1900.

WILLIAM H. ANDERSON.

Witnesses:

F. v. BRIESEN, JOHN HICKMAN.

IOO

